CN116180127A - Macroscopic quantity preparation and application of few-layer transition metal layered double hydroxide - Google Patents

Macroscopic quantity preparation and application of few-layer transition metal layered double hydroxide Download PDF

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CN116180127A
CN116180127A CN202310177311.4A CN202310177311A CN116180127A CN 116180127 A CN116180127 A CN 116180127A CN 202310177311 A CN202310177311 A CN 202310177311A CN 116180127 A CN116180127 A CN 116180127A
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transition metal
ldh
layered double
double hydroxide
few
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蔡卫卫
周顺发
李静
时佳维
郭颖华
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China University of Geosciences
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China University of Geosciences
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
    • C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
    • C25B11/075—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G51/00—Compounds of cobalt
    • C01G51/006—Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G53/00—Compounds of nickel
    • C01G53/006—Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/20—Two-dimensional structures
    • C01P2002/22—Two-dimensional structures layered hydroxide-type, e.g. of the hydrotalcite-type
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/40—Electric properties
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
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Abstract

The invention discloses a macro preparation method of a few-layer transition metal layered double hydroxide, a product prepared by the macro preparation method and application of the product, and belongs to the technical field of preparation of electrolytic water anode electrode materials. The preparation method of the invention comprises the following steps: sequentially dissolving transition metal salt and a surfactant in a solvent, uniformly mixing, adding sodium borohydride, stirring for reaction, centrifuging, washing and drying to obtain a few-layer transition metal layered double hydroxide; the preparation method has the advantages of simplicity, easiness, short preparation time, mild reaction conditions, high yield and the like. The prepared few-layer transition metal layered double hydroxide is used as an electrocatalyst for water oxidation reaction, and has excellent catalytic activity and durability in alkaline electrolyte.

Description

Macroscopic quantity preparation and application of few-layer transition metal layered double hydroxide
Technical Field
The invention belongs to the technical field of preparation of electrolytic water anode electrode materials, and particularly relates to a macro preparation method of a few-layer transition metal layered double hydroxide, a product prepared by the macro preparation method and application of the macro preparation method, in particular to application of the macro preparation method serving as a water oxidation electrocatalyst in electrocatalytic decomposition of water.
Background
Hydrogen is not only an important industrial raw material, but also an efficient secondary clean energy source, and has important significance for developing low-carbon economy and relieving energy crisis. Electrocatalytic water decomposition is one of the most promising technologies for preparing high-purity hydrogen with low carbon at present, and can realize the efficient utilization of renewable energy sources such as hydropower, photovoltaic power generation, wind power and the like. Electrocatalytic water splitting consists of two half reactions, the cathodic Hydrogen Evolution Reaction (HER) and the anodic Oxygen Evolution Reaction (OER), and its efficiency is largely limited by OER, as this is a kinetically slow four electron transfer process. To date, the most successful commercial catalysts for OER are noble metal oxides, such as IrO 2 And RuO (Ruo) 2 But the low reserves of noble metals limit their large-scale use. Therefore, it is important to develop a non-noble metal OER electrocatalyst with abundant reserves.
Among various transition metal-based oxygen evolution reaction electrocatalysts, transition metal Layered Double Hydroxides (LDHs) have received attention because of their abundant reserves, adjustable composition, unique two-dimensional layered structure. However, further improvement of the activity is restricted due to poor conductivity and insufficient exposure of the active site.
For the above reasons, the present application is presented.
Disclosure of Invention
For the above reasons, the present invention aims to provide a macro preparation method of a layered double hydroxide of a few-layer transition metal, and products and applications thereof, which solve or at least partially solve the above technical defects in the prior art. The invention reduces the thickness of LDHs, is beneficial to increasing the specific surface area of LDHs, exposes more defects and coordination unsaturated sites, and is an effective method for improving the catalytic activity of LDHs.
In order to achieve the first object of the present invention, the present invention adopts the following technical scheme:
a macro preparation method of a few-layer transition metal layered double hydroxide, which specifically comprises the following steps:
(a) Sequentially dissolving transition metal salt and a surfactant in an inorganic solvent to prepare a solution A;
(b) Adding sodium borohydride into the solution A, then reacting the obtained mixture for 10-30 min at 25-50 ℃ under stirring, centrifuging, washing and drying the product after the reaction is finished to obtain the few-layer transition metal layered double hydroxide; wherein:
the surfactant comprises any one or more of cetyltrimethylammonium bromide, sodium dodecyl sulfate and the like.
Further, according to the technical scheme, the transition metal salt is transition metal nitrate.
Further, in the above technical solution, the transition metal in the transition metal salt includes any one or several of Ni, fe, co, mn, cr and the like.
Further, according to the technical scheme, the transition metal layered double hydroxide is any one of NiFe-LDH, niCo-LDH, niMn-LDH, niCr-LDH, coFe-LDH, coMn-LDH, niCoMn-LDH, niFeMn-LDH and the like.
Further, in the above technical solution, the inorganic solvent is preferably deionized water.
Further, according to the technical scheme, the concentration of the transition metal salt in the solution A is controlled to be 0.01-3 mol/L.
Further, according to the technical scheme, the concentration of the surfactant in the solution A is controlled to be 0.01-0.1 mol/L.
Further, according to the technical scheme, the molar ratio of the transition metal salt to the sodium borohydride is controlled to be 1:2-3.
Further, according to the technical scheme, the centrifugal and washing process conditions are as follows: centrifuging the product at a rotation speed of 5000-10000 r/min for 2-5 min, then pouring out supernatant, and washing with deionized water for 5-10 times.
Further, according to the technical scheme, the drying process conditions are as follows: drying in a baking oven at 50-100 ℃ for 6-12 h.
A second object of the present invention is to provide a small-layer transition metal layered double hydroxide prepared by the above-described method.
The third object of the invention is to provide the application of the small-layer transition metal layered double hydroxide prepared by the method as a water oxidation electrocatalyst in the electrocatalytic decomposition of water.
A water oxidation electrocatalyst comprising a few-layered transition metal layered double hydroxide prepared by the method described above.
The invention has the remarkable advantages and beneficial effects that:
1. the preparation method is simple and feasible, short in preparation time, mild in reaction condition and high in yield.
2. The prepared few-layer transition metal layered double hydroxide has large specific surface area, can expose more active sites, and meanwhile, the structure of the few layers is beneficial to forming more defects and coordination unsaturated sites, which is beneficial to improving the intrinsic activity of the catalyst.
3. The prepared few-layer transition metal layered double hydroxide has low water oxidation reaction overpotential and excellent cycle stability and durability.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is an X-ray diffraction pattern of the f-NiFe-LDH prepared in example 1 of the present invention.
FIG. 2 is a Scanning Electron Microscope (SEM) of the f-NiFe-LDH prepared in example 1 of the present invention at various magnifications.
FIG. 3 is an Atomic Force Microscope (AFM) image of the f-NiFe-LDH prepared in example 1 of the present invention.
FIG. 4 is a schematic diagram of the f-NiFe-LDH and commercial RuO prepared in example 1 of the present invention 2 The resulting linear sweep voltammogram was used for water oxidation performance testing in a 1M KOH electrolyte.
FIG. 5 is a LSV curve of an f-NiFe-LDH prepared in example 1 of the present invention before and after 3000 cyclic voltammetry tests in a 1M KOH electrolyte.
FIG. 6 is a chronoamperometric curve of the f-NiFe-LDH prepared in example 1 of the present invention at a fixed potential in a 1M KOH electrolyte.
FIG. 7 is a schematic diagram of the f-CoFe-LDH and commercial RuO prepared in example 2 of the present invention 2 The resulting linear sweep voltammogram was used for water oxidation performance testing in a 1M KOH electrolyte.
FIG. 8 is a schematic diagram of the f-NiFeMn-LDH and commercial RuO prepared in example 3 of the present invention 2 The resulting linear sweep voltammogram was used for water oxidation performance testing in a 1M KOH electrolyte.
Detailed Description
The invention provides a macro preparation method of a few-layer transition metal layered double hydroxide, which is simple and feasible, short in preparation time, mild in reaction condition and high in yield, and the few-layer transition metal layered double hydroxide prepared by the invention is used as a water oxidation electrocatalyst for electrocatalytically decomposing water, so that the invention has excellent catalytic activity and stability.
The invention is described in further detail below by way of examples.
For a better understanding of the present invention, and not to limit its scope, all numbers expressing quantities, percentages, and other values used in the present application are to be understood as being modified in all instances by the term "about". Accordingly, unless specifically indicated otherwise, the numerical parameters set forth in the specification are approximations that may vary depending upon the desired properties sought to be obtained. Each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
The equipment and materials used in the present invention are commercially available or are commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified.
Example 1
The present example further illustrates the macro preparation method of the few-layer transition metal layered double hydroxide of the present application using nickel nitrate hexahydrate and ferric nitrate nonahydrate as transition metal salts.
The macro preparation method of the few-layer transition metal layered double hydroxide comprises the following steps:
(a) 1.8581g of nickel nitrate hexahydrate (6.39 mmol), 0.8605g (2.13 mmol) of ferric nitrate nonahydrate and 0.5g (1.37 mmol) of cetyltrimethylammonium bromide were dissolved in 50mL of deionized water in this order at room temperature to prepare a solution A.
(b) To solution A, 0.9684g of sodium borohydride (25.6 mmol) was added at room temperature (25 ℃ C.) and stirring was continued for 20min, after which the mixture was centrifuged at 10000r/min for 3min, the supernatant was then decanted and washed 5 times with deionized water. And (3) drying the washed product in a baking oven at 60 ℃ for 6 hours to obtain the small-layer NiFe layered double hydroxide (f-NiFe-LDH).
Example 2
In the embodiment, cobalt nitrate hexahydrate and ferric nitrate nonahydrate are used as transition metal salts, so that the macro preparation method of the few-layer transition metal layered double hydroxide is further described.
The macro preparation method of the few-layer transition metal layered double hydroxide comprises the following steps:
(a) 1.8597g of cobalt nitrate hexahydrate (6.39 mmol), 0.8605g (2.13 mmol) of ferric nitrate nonahydrate and 0.5g of cetyltrimethylammonium bromide (1.37 mmol) were sequentially dissolved in 50mL of deionized water at room temperature to prepare a solution A.
(b) To solution A, 0.9684g of sodium borohydride (25.6 mmol) was added at room temperature, stirring was continued for 20min, and then the above mixture was centrifuged at 10000r/min for 3min, and the supernatant was then poured off and washed with deionized water for 5 times. And (3) drying the washed product in a 60 ℃ oven for 6 hours to obtain the few-layer CoFe layered double hydroxide (f-CoFe-LDH).
Example 3
The present example further illustrates the macro preparation method of the few-layer transition metal layered double hydroxide of the present application using nickel nitrate hexahydrate, ferric nitrate nonahydrate and manganese nitrate tetrahydrate as transition metal salts.
The macro preparation method of the few-layer transition metal layered double hydroxide comprises the following steps:
(a) Solution A was prepared by dissolving 1.4859g of nickel nitrate hexahydrate (5.11 mmol), 0.6868g (1.70 mmol) of ferric nitrate nonahydrate, 0.4267g (1.70 mmol) of manganese nitrate tetrahydrate and 0.5g (1.37 mmol) of cetyltrimethylammonium bromide in 50mL of deionized water in this order at room temperature.
(b) To solution A, 0.9684g of sodium borohydride (25.6 mmol) was added at room temperature, stirring was continued for 20min, and then the above mixture was centrifuged at 10000r/min for 3min, and the supernatant was then poured off and washed with deionized water for 5 times. And (3) drying the washed product in a baking oven at 60 ℃ for 6 hours to obtain the small-layer NiFeMn layered double hydroxide (f-NiFeMn-LDH).
Electrochemical performance test:
testing of the products prepared in the examples above, and RuO in the prior art, using Gamry electrochemical workstation 2 The water oxidation activity of the catalyst.
The electrochemical performance test uses Hg/HgO electrode as reference electrode, carbon rod as counter electrode, glassy carbon electrode loaded with catalyst as working electrode, electrolyte is 1M KOH, oxygen is introduced for 30min before water oxidation performance test, so that oxygen in the electrolyte is saturated, and oxygen is introduced in the whole process of test to maintain balance potential of oxygen evolution reaction unchanged. The sweep rate for the linear sweep voltammetric test was 5mV/s.
FIG. 1 is an X-ray diffraction pattern of the f-NiFe-LDH prepared in example 1 of the present invention, showing that the f-NiFe-LDH exhibits a typical layered double hydroxide structure.
FIG. 2 is a Scanning Electron Microscope (SEM) of the f-NiFe-LDH prepared in example 1 of the present invention at various magnifications. From fig. 2, it can be seen that the prepared f-NiFe-LDH exhibits the morphology of nanoflower composed of curled ultrathin nanoplatelets.
FIG. 3 is an Atomic Force Microscope (AFM) image of the f-NiFe-LDH prepared in example 1 of the present invention. The nano-sheet of f-NiFe-LDH is about 1.1nm in thickness and consists of 1-2 layers of single-layer hydrotalcite, and the structure of few layers is proved.
FIG. 4 is a schematic diagram of the f-NiFe-LDH and commercial RuO prepared in example 1 of the present invention 2 The resulting linear sweep voltammogram was used for water oxidation performance testing in a 1M KOH electrolyte. It can be seen that the current density is 10mAcm -2 When the f-NiFe-LDH has an overpotential of only 209mV, which is far lower than that of commercial RuO 2 284mV, indicating excellent water oxidation activity.
FIG. 5 is a LSV curve of an f-NiFe-LDH prepared in example 1 of the present invention before and after 3000 cyclic voltammetry tests in a 1M KOH electrolyte. It can be seen that the LSV curve after 3000 cyclic voltammetry tests substantially coincides with the LSV curve before the test, confirming that the f-NiFe-LDH has excellent cyclic stability.
FIG. 6 is a chronoamperometric curve of the f-NiFe-LDH prepared in example 1 of the present invention at a fixed potential in a 1M KOH electrolyte. It can be seen that at an overpotential of 210mV, the current density of the f-NiFe-LDH can be kept essentially unchanged for 60h, indicating its excellent stability.
FIG. 7 is a schematic diagram of the f-CoFe-LDH and commercial RuO prepared in example 2 of the present invention 2 The resulting linear sweep voltammogram was used for water oxidation performance testing in a 1M KOH electrolyte. It can be seen that the current density is 10mAcm -2 At an overpotential of 279mV for f-CoFe-LDH, lower than commercial RuO 2 284mV, indicating excellent water oxidation activity.
FIG. 8 is a schematic diagram of the f-NiFeMn-LDH and commercial RuO prepared in example 3 of the present invention 2 The resulting linear sweep voltammogram was used for water oxidation performance testing in a 1M KOH electrolyte. It can be seen that the current density isThe degree is 10mA cm -2 When the f-NiFeMn-LDH has an overpotential of 227mV, which is lower than that of commercial RuO 2 284mV, indicating excellent water oxidation activity.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (9)

1. A macro preparation method of a few-layer transition metal layered double hydroxide is characterized by comprising the following steps of: the method specifically comprises the following steps:
(a) Sequentially dissolving transition metal salt and a surfactant in an inorganic solvent to prepare a solution A;
(b) Adding sodium borohydride into the solution A, then reacting the obtained mixture for 10-30 min at 25-50 ℃ under stirring, centrifuging, washing and drying the product after the reaction is finished to obtain the few-layer transition metal layered double hydroxide; wherein:
the surfactant comprises any one or more of cetyltrimethylammonium bromide, sodium dodecyl sulfate and sodium dodecyl sulfate.
2. The method according to claim 1, characterized in that: the transition metal in the transition metal salt comprises any one or more of Ni, fe, co, mn, cr.
3. The method according to claim 1, characterized in that: the transition metal layered double hydroxide is any one of NiFe-LDH, niCo-LDH, niMn-LDH, niCr-LDH, coFe-LDH, coMn-LDH, niCoMn-LDH and NiFeMn-LDH.
4. The method according to claim 1, characterized in that: the concentration of the transition metal salt in the solution A is controlled to be 0.01-3 mol/L.
5. The method according to claim 1, characterized in that: the concentration of the surfactant in the solution A is controlled to be 0.01-0.1 mol/L.
6. The method according to claim 1, characterized in that: the molar ratio of the transition metal salt to the sodium borohydride is controlled to be 1:2-3.
7. A few-layer transition metal layered double hydroxide prepared by the method of any one of claims 1 to 6.
8. The use of the low-layer transition metal layered double hydroxide prepared by the method of any one of claims 1 to 6 as a water oxidation electrocatalyst for the electrocatalytic decomposition of water.
9. A water oxidation electrocatalyst, characterized by: the catalyst comprises the few-layer transition metal layered double hydroxide prepared by the method of any one of claims 1 to 6.
CN202310177311.4A 2023-02-28 2023-02-28 Macroscopic quantity preparation and application of few-layer transition metal layered double hydroxide Pending CN116180127A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117865242A (en) * 2024-03-12 2024-04-12 四川大学 OER electrocatalyst and preparation method and application thereof
CN117865242B (en) * 2024-03-12 2024-05-31 四川大学 OER electrocatalyst and preparation method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117865242A (en) * 2024-03-12 2024-04-12 四川大学 OER electrocatalyst and preparation method and application thereof
CN117865242B (en) * 2024-03-12 2024-05-31 四川大学 OER electrocatalyst and preparation method and application thereof

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